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Updated: May 5, 2025
The potentiometer must never be shunted around the B battery or the latter will soon run down. A potentiometer costs a couple of dollars. The Parts and How to Connect Them Up. To wire up the parts connect the leading-in wire of the aerial with the primary coil, which is the middle one of the tuner, and connect the other terminal with the ground.
If only one end can be fixed to some elevated support then you can secure the other end to a post in the ground, but the slope of the aerial should not be more than 30 or 35 degrees from the horizontal at most as shown at B. The leading-in wire must be carefully insulated from the outside of the building and also where it passes through it to the inside.
You do not need to bother about these added factors that make for high efficiency until after you have got your receiving set in working order and understand all about it. The Parts and How to Connect Them Up. To wire up the parts begin by connecting the leading-in wire to one end of the primary of the tuning coil and then connect the other end of the coil with the ground.
To obviate this loss, or at least to reduce it to a minimum, I usually screen the rarefied gas surrounding the stem from the inductive action of the leading-in wire by providing the stem with a tube or coating of conducting material. It seems beyond doubt that the best among metals to employ for this purpose is aluminium, on account of its many remarkable properties.
The metal tube placed on the stem containing the leading-in wire performs really two distinct functions: First: it acts more or less as an electrostatic screen, thus economizing the energy supplied to the bulb; and, second, to whatever extent it may fail to act electrostatically, it acts mechanically, preventing the bombardment, and consequently intense heating and possible deterioration of the slender support of the refractory incandescent body, or of the glass stem containing the leading-in wire.
Finally twist the ends of each pair of short wires to the free ends of the insulators and then twist the free ends of the wires together. For the leading-in wire that goes to the lightning switch take two lengths of wire and twist one end of each one around the aerial wires and solder them there.
This is done by means of an insulating tube known as a leading-in insulator, or bulkhead insulator as it is sometimes called. As a protection against lightning burning out your instruments you can use either: an air-gap lightning arrester, a vacuum tube protector, or a lightning switch, which is better.
In using a counterpoise you must bring the wire from it up to and through another leading-in insulator to your instruments. With a crystal detector receiving set you can receive either telegraphic dots and dashes or telephonic speech and music. You can buy a receiving set already assembled or you can buy the different parts and assemble them yourself.
Bring the free end of the leading-in wire down to the middle post of the lightning switch and fasten it there and connect up the receiver to it and the ground as described under the caption of A Single Wire Aerial. Connecting in the Ground.
In this case, namely, the metal tube is in good electrical connection with the leading-in wire, and most of the bombardment is directed upon the tube.
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